As a successful actress and singer who had a stint in rehab, 21-year-old Demi Lovato has experienced a lot in her young career. But all her experiences served as inspiration for her book, Staying Strong: 365 Days a Year, which came out this last month.

Celebuzz caught up with Lovato this weekend at her Nylon Magazine cover party and asked about her writing process.

Lovato told the site that the hardest part about completing her book was "finding the time to sit down and write." Reportedly, the singer was only able to write while traveling, because of her busy work schedule.

"A lot of people don’t really write their own books [they have ghost writers]," Lovato said, "which is probably something that anybody who’s not a natural author really needs. But this [writing my book] was really easy because it wasn’t a memoir. I have first drafts covered in coffee stains!"

Lovato's book, on sale now, is already a New York Times Best Seller.

Read more about Lovato's writing experience on Celebuzz.com.

Related on HuffPost:

Loading Slideshow...